EFFECT OF BENOMYL AND CARBOFURAN ON APHELENCHOIDES BESSEYI ON RICE

The efficiency of benomyl applied as seed treatment and spray and that of carbofuran applied in floodwater were tested to prevent infestation of rice plants by Aphelenchoides besseyi when the nematode was introduced into floodwater at different growth stages of the crop. When A. besseyi was inoculated at transplanting, benomyl effectively controlled it when applied as seed treatment and sprayed 1 or 15 days after transplanting. Benomyl failed lo protect the plants when applied as seed treatment, and/or sprayed 5 days after nematode inoculation at transplanting, maximum tillering, and/or panicle initiation. Carbofuran broadcast in floodwater 1 or 30 days after nematode inoculation at transplanting failed to control the nematode. In addition to hot water treatment of the seeds, a combination of benomyl seed treatment and spraying 1 or 15 days after transplanting may be used to protect rice plants from infestation by A. besseyi that survive in the field and to produce seeds free of A. besseyi.